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土壤有机碳化合物对热带单一种植和多物种森林之间添加的反应

Yue Li¹, Mengyu Wu², Ting Zhao²

¹Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China.

The Science of the total environment

|July 13, 2024

概括

添加对热带森林土壤有机碳 (SOC) 的影响因森林类型而异. 在单一种植中,它减少了保留碳的微生物群落,而多物种森林由于植物和微生物相互作用而显示出更稳定的SOC.

科学领域:

热带生态热带生态
土壤科学土壤科学
生物地质化学生物地质化学

背景情况:

热带森林对和的可用性非常敏感.
在营养物质应用下,土壤有机碳 (SOC) 保存的机制尚未完全理解.
森林对营养添加的特定反应需要进一步研究.

研究的目的:

通过生物化学选择来调查森林特有的SOC保护,以应对营养应用.
揭示微生物群落如何调解SOC对 (P) 添加的反应.
通过元分析量化P应用对热带森林中SOC含量的影响.

主要方法:

实地实验在一个单一种植 (木瓜种植园) 和一个多种植的森林中进行了长期受精.
测量植物和微生物衍生的C化合物.
来自62项关于P应用对SOC含量影响的研究中的125个配对测量的元分析.

主要成果:

在P添加下,亚卡西亚种植园中的微生物群落转移导致了微生物残留碳 (MRC) 的消耗.
在多种森林中,P添加刺激了植物和微生物碳的分解.
分析显示,在热带森林中,大量SOC含量对P添加的反应是中性的,根据实验持续时间和树种的变化.

结论:

微生物群落的组成和活动调解了森林特定的SOC对P添加的反应.
慢性P添加可能对热带森林中的SOC积累和稳定性有害,特别是通过减少真菌MRC.
生物起源的SOC化合物,矿物相关有机碳 (MAOC) 和土壤池之间的密切关联凸显了生物成分对SOC稳定性的重要性.

关键词:

添加营养成分添加营养成分植物基质植物基质土壤碳化合物土壤碳化合物土壤微生物活动热带雨林是一个热带雨林.

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